module NeuralNetworks

struct Linear
    W::Matrix{Float64}
    b::Vector{Float64}
end

function (l::Linear)(x::Vector{Float64})
end

struct Activation
end

struct MLP
end

struct AffineCoupling
end

function (f::AffineCoupling)(x::Vector{Float64})::Float64
    return 0.
end

struct RealNVP
    layers::Vector{AffineCoupling}

    function RealNVP()
        layers = Vector{AffineCoupling}()
        new(layers)
    end
end

function (f::RealNVP)(x::Vector{Float64})::Float64
    ldJ::Float64 = 0.
    for l! in f.layers
        ldJ += l!(x)
    end
    return ldJ
end

end